\begin{table}

\caption{\label{tab:countries}Country coverage. Alpha-2 and alpha-3 country codes according to ISO 3166-1.}
\centering
\fontsize{9}{11}\selectfont
\begin{tabular}[t]{l>{}c>{}c}
\toprule
\multicolumn{1}{c}{ } & \multicolumn{2}{c}{Country code} \\
\cmidrule(l{3pt}r{3pt}){2-3}
Country name & alpha-2 & alpha-3\\
\midrule
Australia & \ttfamily{AU} & \ttfamily{AUS}\\
Austria & \ttfamily{AT} & \ttfamily{AUT}\\
Belgium & \ttfamily{BE} & \ttfamily{BEL}\\
Canada & \ttfamily{CA} & \ttfamily{CAN}\\
Denmark & \ttfamily{DK} & \ttfamily{DNK}\\
Finland & \ttfamily{FI} & \ttfamily{FIN}\\
France & \ttfamily{FR} & \ttfamily{FRA}\\
Germany & \ttfamily{DE} & \ttfamily{DEU}\\
Greece & \ttfamily{GR} & \ttfamily{GRC}\\
Ireland & \ttfamily{IE} & \ttfamily{IRL}\\
Italy & \ttfamily{IT} & \ttfamily{ITA}\\
Luxembourg & \ttfamily{LU} & \ttfamily{LUX}\\
Netherlands & \ttfamily{NL} & \ttfamily{NLD}\\
New Zealand & \ttfamily{NZ} & \ttfamily{NZL}\\
Norway & \ttfamily{NO} & \ttfamily{NOR}\\
Portugal & \ttfamily{PT} & \ttfamily{PRT}\\
Spain & \ttfamily{ES} & \ttfamily{ESP}\\
Sweden & \ttfamily{SE} & \ttfamily{SWE}\\
Switzerland & \ttfamily{CH} & \ttfamily{CHE}\\
United Kingdom & \ttfamily{GB} & \ttfamily{GBR}\\
\bottomrule
\end{tabular}
\end{table}
